I am actually pretty happy if this is not a common problem because it means I probably won't see it on my next machine.On 11/13/2014 04:52 AM, Timothy Redmond wrote:I have a Thinkpad W520 computer (4270CTO) and I am running Fedora 20 and keeping its packages up to date. Often when I am working the cpu frequency transitions beautifully and the computer is very responsive. I have run some programs that take a long time (hours to days) and have watched the frequency go up when there is only one thread running and go down when there are several threads running. So it seems to be working very nicely.My W520 (on F19) does not show this problem. Have a look at system messages; there could be thermal related limits which are enforced even if the load and preferences would like to have a high speed.
These messages are followed byNov 13 09:12:45 Neptune mcelog[1203]: Hardware event. This is not a software error. Nov 13 09:12:45 Neptune mcelog[1203]: MCE 0 Nov 13 09:12:45 Neptune mcelog[1203]: CPU 3 THERMAL EVENT TSC 8c06f1a9b8f7 Nov 13 09:12:45 Neptune mcelog[1203]: TIME 1415898623 Thu Nov 13 09:10:23 2014 Nov 13 09:12:45 Neptune mcelog[1203]: Processor 3 heated above trip temperature. Throttling enabled. Nov 13 09:12:45 Neptune mcelog[1203]: Please check your system cooling. Performance will be impacted Nov 13 09:12:45 Neptune mcelog[1203]: STATUS 8803000b MCGSTATUS 0 Nov 13 09:12:45 Neptune mcelog[1203]: MCGCAP c09 APICID 3 SOCKETID 0 Nov 13 09:12:45 Neptune mcelog[1203]: CPUID Vendor Intel Family 6 Model 42
a few seconds later.Nov 13 09:21:17 Neptune kernel: CPU3: Core temperature/speed normal